Ben Medley, LCSW

Ben Medley, LCSW is an AEDP senior faculty member and has taught AEDP internationally with the AEDP Institute, the National Institute of Psychotherapy, the Cape Cod Institute, NASW and in mental health organizations and clinical practices. In addition to teaching, he enjoys supervising AEDP clinicians individually and in groups. Ben has a private practice in New York City and specializes in working with the LGBTQ+ community. He earned his degree in Clinical Social Work with the NYU Silver School of Social Work. Before private practice, Ben worked in Greenwich House’s HIV mental health program and the Jewish Board of Family and Children’s Services’ LGBTQ+ mental health treatment unit. His paper “Recovering the True Self: Affirmative Therapy, Attachment and AEDP in Psychotherapy with Gay Men” is published with the SEPI Journal: the Journal of Psychotherapy Integration and he has written a chapter on using portrayals to process core affective experience for the most recent AEDP book Undoing Aloneness and the Transformation of Suffering Into Flourishing: AEDP 2.0, Washington D.C.: APA.

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Gil Tunnell, PhD

Gil is a clinical psychologist in private practice in New York City. He is a founding Senior Faculty member of the AEDP Institute and now serves as Consulting Editor for Transformance: The AEDP Journal. With Jenna Osiason, he wrote “Historical Context: AEDP’s Place in the World of Psychotherapy,” Undoing Aloneness & the Transformance of Suffering into Flourishing: AEDP 2.0, APA Books, 2021. Dr. Tunnell is co-author with David Greenan of Couple Therapy with Gay Men (Guilford, 2002), and has presented and published widely on working with gay men, most recently, “Unequivocal affirmation” of True Self in 16-session AEDP with Gay Men: Using Relational Metaprocessing to Increase Receptive Affective Capacity, Transformance Journal, 2023, 11 (1). His special interest is applying AEDP to couple therapy. (more…)

Richard Harrison, PhD

Richard Harrison, PhD, is a faculty member of AEDP™ Institute and a Registered Psychologist with over 25 years’ experience as a clinician and teacher. He was trained and supervised in AEDP by Diana Fosha, founder of the model. He is a Certified Supervisor in both AEDP and EFT. Richard teaches and supervises graduate students in the Counseling Psychology and Psychiatry departments at the University of British Columbia, and maintains a full clinical caseload with individuals and couples in private practice in Vancouver.

Richard has authored peer-reviewed publications on AEDP theory and practice; attachment-informed supervision; and therapist self-care; including a 2020 article in Psychotherapy on “Termination in 16-session

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Kate Halliday, LCSW

Kate Halliday, LCSW, is Senior Faculty, AEDP Institute from Ithaca, New York.

Throughout Kate’s nearly 30 years as a psychotherapist, She has always been better at noticing the ways her clients are remarkable, resilient, and lovable than theorizing about the ways they are wounded.

Kate has always been drawn to images, representations, and experiences of transformation. Music, poetry, literature, the natural world, and emotional relationships have always been her education. When Kate started learning to be a teacher of young children (in her first career she worked for Head Start and in elementary schools), and then to be a therapist, it was the magic of witnessing change and growth in other human beings that enlivened the experience for her. In psychotherapy, this led Kate to study Family Systems Theory and Narrative Therapy, then EMDR, and finally AEDP. (more…)

Annika Medbo, Licensed Psychotherapist

Annika Medbo is a faculty member of AEDP Institute. She is a Licensed Psychotherapist and Licensed Physiotherapist in private practice in Stockholm, Sweden.

She is one of the founders of the Swedish AEDP Community and has played a key role in spreading and developing AEDP in Western Europe, particularly in Scandinavia. Together with Anna Christina Sundgren, she continuously arranges and teaches Core Training in Sweden, Norway and online. In addition to teaching Core Training, she is an appreciated teacher in the Institute’s Essential Skills courses.

Annika has always been deeply interested in exploring and expanding her understanding of the natural, innate forces that drive growth and healing—both within the individual and in the profound interactions between people. In AEDP, she found a model and framework that allowed her to cultivate this passion and eventually begin structuring her discoveries through her clinical work with patients.

Through this work, a particular interest in working with the deepest attachment traumas has emerged—specifically in addressing various forms of profound neglect. Drawing on infant research, she integrates insights both to understand the phenomena that emerge in the therapeutic process and to deepen her comprehension of early attachment formation.

Building on this evolving understanding, Annika has refined her AEDP approach and skills to better meet patients’ needs at this level of trauma work. Her commitment to advancing the AEDP model is reflected in her recent article, Finding, Forming, and Transforming the Self: A Journey From No Self to Core Self, published inTransformance, the AEDP Journal, volume 13

Sigal Bahat, MA

Sigal Bahat, MA, is a faculty member of AEDP™ Institute and the Institute’s ambassador to the AEDP in the Israel region. She teaches and supervises AEDP in Israel, the US, and internationally. She has a private practice in Israel and works remotely.

Sigal started her career as a Dance Movement Therapist and then completed training both as an Expressive & Creative psychotherapist and a Bio-energetic Analyst. She is certified and has many years of experience teaching somatic mindfulness approaches: The Alexander Technique, The Feldenkrais Method, and Authentic Movement.

Meeting with AEDP and Dr. Diana Fosha resonated with a decades-long quest for the intra-intimate connections between the mind and the psyche-soma. Sigal brings to AEDP elaborate teachings of the clinical use of the Somatic Portal and the nonverbal communication layer between therapist and patient.

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Jennifer Edlin, MFT

Jennifer Edlin, MFT  is a psychotherapist in private practice in Oakland, California, and is a Senior faculty member of AEDP™ Institute.  Jenn received her undergraduate degree from Princeton University, a JD/MBA degree from New York University and an MA in Counseling Psychology from the California Institute of Integral Studies. From the moment she attended her first AEDP Immersion Course, Jenn was taken by AEDP and the permission to be authentic and to use the therapist’s whole self in service of clients’ healing and transformation.

Jenn is developing AEDP theory and clinical interventions to use with dysregulated and underregulated clients, and has presented her work in 2019 in Boston, Portland and the Denver Immersion course.  In the years since she joined the AEDP Institute Faculty Jenn has been a Co-Director of the AEDP research project, (more…)

Danny Yeung, MD, CCFP, MDPAC(C), FCFP

Senior Faculty of the AEDP Institute and Chair of International Development, Danny Yeung is a trainer and supervisor of Accelerated Experiential Dynamic Psychotherapy (AEDP) for post-graduate mental health professionals in Hong Kong, China, South Korea, United States and Canada. An Assistant Professor with the Temerty Faculty of Medicine at the University of Toronto, he was personally honored, for his local and global AEDP teaching projects, with the Joel Sadavoy Community Mental Health Award for 2011, Peter R. Newman Humanitarian Award for 2013, and a two time recipient of Award of Excellence from the College of Family Physicians of Canada for 2012 and 2022.

Danny is the author of The Instinct to Heal: Practicing Accelerated Experiential Dynamic Psychotherapy, the first original AEDP book to published 2023 in China. He is a contributor of a chapter titled What Went Right: What Happens in the Brain During AEDP’s Metatherapeutic Processing, in the award winning book Undoing Aloneness and the Transformation of Suffering Into Flourishing: AEDP 2.0 and has served as the Translation Reviewer for the Chinese version of The Transforming Power of Affect and Undoing Aloneness and the Transformation of Suffering Into Flourishing: AEDP 2.0. 

Danny is a contributor of a chapter titled The Art of Non-Doing and Self-Transformation of Things, in Chinese Culture and Psychotherapy and is regarded as having made an epoch defining contribution to integrating psychotherapy with Chinese culture.  He is also the lead author of The Rainbow After: Psychological Trauma and Accelerated Experiential Dynamic Psychotherapy, arguably one of the original trauma treatment manual published in Chinese. He coauthored Portrait of the Soul, a study of nine personality styles, currently in its 6 th edition. Together with Dr. Diana Fosha, he also coauthored a chapter in the Casebook of Psychotherapy Integration, published by American Psychological Association. 

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Natasha Prenn, LCSW

Natasha Prenn, LCSW, senior faculty member. Natasha has dedicated her career to translating AEDP® theory into clear, actionable steps and refining the language used in interventions. With a deep commitment to making AEDP® training accessible and practical, Natasha pioneered both the AEDP® Essential and Advanced Skills Courses. 

Natasha’s dedication to training therapists led to her co-authoring Supervision Essentials for Accelerated Experiential Dynamic Psychotherapy with Diana Fosha. Her latest book, Deliberate Practice in Accelerated Experiential Dynamic Psychotherapy, co-authored with Hanna Levenson (APA June 2025), focuses on the systematic practice of AEDP skills and interventions.

Natasha offers coaching and psychotherapy to individuals and couples and AEDP® supervision for therapists. She is a founding editor, alongside Kari Gleiser, of Transformance: The AEDP Journal. Some of her articles and book chapters are available on the AEDP® website.

 

Eileen M. Russell, PhD

Eileen M. Russell, PhD, is a clinical psychologist and a founding faculty member of the AEDP Institute. She began studying and training in AEDP in 1996 with Drs. Diana Fosha and Jenna Osiason. Dr. Russell has been an adjunct faculty member at NYU Medical/ Bellevue Hospital Center where she completed her internship training and later worked as a senior psychologist with individuals struggling with addiction and psychiatric diagnoses. She is currently also on the faculty of the National Institute of the Psychotherapies (NIP) Integrative Trauma Program. Her passion is AEDP, which she has taught to individuals and groups since 2004 nationally and internationally. She combines a warm and gentle clinical style with a probing and articulate interest in theory to bring out the depths of the AEDP approach. In addition to her practice with patients and consultees, Eileen enjoys expanding clinical and theoretical ideas through writing. She published the second professional book on AEDP called, Restoring Resilience: Discovering your Clients’ Capacity for Healing (W.W. Norton & Co., June 2015). She co-authored a paper with Diana Fosha, entitled, “Transformational affects and core state in AEDP” (2008). More recently she has been exploring the centrality of the sense of agency to healing and change in a chapter in Undoing Aloneness and the Transformation of Suffering Into Flourishing (APA, 2021).

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